Back in 1991, BOSS unleashed the now-controversial Metal Zone — the stompbox that housed more over-the-top high-gain distortion than any competing product at the time. The BOSS 30th Anniversary Metal Zone celebrates three decades of this iconic pedalboard classic, boasting the same dial-stage gain circuit along with an eye-grabbing grayscale color scheme that's guaranteed to attract attention. You also get the original pedal's oft-abused 3-band semi-parametric EQ, which provides ±15dB of boost or cut for surgical sonic sculpting. The BOSS Metal Zone is a classic — just about every budding metal guitarist has plugged one of these distortion pedals into a solid-state practice amp, dimed the gain, and massacred "Smoke on the Water." That said, this hyper-aggressive stomp continues to make its way onto countless pro-level pedalboards as well. If you're aiming for insane, ultra-saturated high-gain tones, there's nothing else like the Metal Zone.